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COMPRESSORS
other units remain underused or even idle for extended periods.
It is also an issue where secondary compressors are repeatedly brought into service for short periods to support the primary compressor when additional capacity is required. Such on-off cycling over time causes stress to motors, which can result in overheating and, in the extreme cases, complete burn-out. Mr Pribyl says: “On many multi-compressor packs, a small number of compressors often end up doing much of the work due to the run sequencing control and load profile. This is obviously not ideal and invites trouble. Add to this the cut-back in routine maintenance during the pandemic, and it creates a serious source of stress and risk for refrigeration systems.”
He added: “It is a lot less expensive to rotate compressors, removing worn units and remanufacturing and replacing them on a planned basis, rather than waiting for the pack to break down and having to replace the failed unit in an emergency.” Green Point operates a planned compressor rotation service for multi-compressor packs
as part of its support for contractors, ensuring plant remains operational and continues to perform efficiently.
The approach is aimed particularly at business critical areas such as the food and drink industry, data centre cooling, and high value process applications such as pharmaceuticals and the chemical, oil and gas industries.
“The ideal rotation interval will depend
on the operating conditions and running hours for the pack. However, we can advise contractors so they can in turn formulate a sensible rotation programme for their end user customer,” he said.
“As the work is planned, we make sure all
necessary replacement components are in stock, so turn-around is as fast as possible, usually just a couple of days. However, as
the outgoing compressor is removed on site, a like-for-like replacement is immediately installed, so downtime is minimised and system capacity remains unaffected.” He added: “We can also visit sites to advise
on maintenance requirements. An added benefit of dealing with Green Point, is that, as the manufacturer’s specialist support arm, we have access to the full stock of original replacement components, ensuring high quality performance, reliability and efficiency.”
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www.acr-news.com December 2021 15
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